Why Tidy?

For the past few days, we’ve been grapping with a data set that we’ve almost wrestled down to size. The only problem is, what we’re left with is a big table with one score per row, and a lot of NAs. This doesn’t seem efficient, nor does it seem like a good format for plotting. Clearly, we need to TIDY THE DATA.

Long versus Wide

As we talked about a few weeks ago, there are both long and wide data formats. Long data formats have one observation and one measurement per row. So, multiple rows constitude a single observation.